Take me to The River Why: world premiere Sept. 9 at Hollywood Theatre in Portland.

Actor William Hurt will be at the world premiere of The River Why Sept. 9 at Hollywood Theatre in Portland, a benefit for the River Network. The movie, filmed on the Clackamas, Nahalem, Nisqually and North Umpqua rivers, is about 20-year-old flyfisherman Gus Orviston who rebels from his family and leaves Portland to live in a secluded cabin, ending up on a journey of self-discovery. (Which, River Network points out, “was only possible because he had access to a healthy river!”)Actors Zach Gilford, Alex Hurt and producer Kristi Denton Cohen will also be on hand before the screening and for a post-film Q & A. Seating is limited and $20 tickets can be purchased online.The River Why is based on the 1983 novel by David James Duncan. It's part of the Active Cinema movement, which in this case aims to inspire audiences to take care of the rivers and lands the film highlights. So with that, River Network hopes filmgoers will be encouraged to attend the Clackamas River Cleanup Sunday, Sept. 11.The premiere of The River Why will also serve as the official kick-off leading up to the 13th annual National River Rally, which River network and Waterkeeper Alliance will bring to Portland for the first time May 4-7. River Rally is billed as the biggest gathering of river and watershed conservation leaders in the country. Bobby Kennedy Jr. and Alexandra Cousteau will be keynote speakers.